It didn't take me long to get a lot of the rages. Like 6 hours and I had 93. I think whats going to take a while is getting Genji gloves from Dragon in the floating continent. I've been stealing for days and have on aquired potions. I got a system too, save as early as possible. Then fight and never save unless you get genji gloves. That way you don't get to level 99 and ruin your stats.
Here is the list of rages you can get before world of ruin. there are 117 of them. Give or take a few.
<DIR>1<SUP>st</SUP> class
Abolisher
Actaneon
Adamanchyt
Anguiform
Apokryphos
Apparite
Areneid
aspik
Balloon
Baskervor
Beakor
Behemoth
Bleary
Bomb
Bounty man
Brain pan
Brawler
Bug
Cadet
Cephaler
Chaser
Chicken lip
Chimera
Cispius
coelcite
Commander
Commando
Crasshopper
Crawly
Dark side
Dark wind
Doberman
Dragon
Exocite
Fidor
Flan
Fossil fang
Gabble de gak
Garm
General
Ghost
Gigantos
Gobbler
gold bear
Grease monkey
Grenade
Grunt
Guard
Hazer
Heavy armor
Hornet
Ing
Insecare
intangir
Iron fist
Joker
Leafer
Lich
Lobo
Mag roader
Magi tek armor
Mandrake
Merchant
Mind candy
misfit
Nautiloid
ninja
Officer
over mind
overgrunk
Pipsqueak
piranha
Poplium
Primoridite
Proto armor
pterodon
Ralph
Red fang
Repo man
Rhinotaur
Rhinox
Rhobite
Rhodox
Rider
Rinn
Sand ray
sewer rat
Sky armor
Slam dancer
Slurm
soldier
special forces
Specter
Spectre
Spit fire
Still going
stray cat
Telstar
templar
Trapper
trilium
trilobiter
trooper
Tusker
vaporite
Vector pup
vermin
vomammoth
Vulture
weed feeder
Were rat
Whisper
wild rat
Wirey dragon
Wyvern
zombone
</DIR>